Yes, hoax is a Scrabble word!
...and is worth 14 points in Scrabble, and 13 points in Words with Friends
hoax
Verb
1. Subject to a playful hoax or joke
Noun
1. Something intended to deceive; deliberate trickery intended to gain an advantage
What Scrabble words can I make with the letters in hoax?
3 Letter Words
2 Letter Words